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pc: Require IRQ remapping and EIM if there could be x2APIC CPUs

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It would prevent starting guest with incorrect configs
where interrupts couldn't be delivered to CPUs with
APIC IDs > 255.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Igor Mammedov 2016-10-19 14:05:42 +02:00 committed by Eduardo Habkost
parent 080ac219cc
commit 60c5e1040e
1 changed files with 14 additions and 0 deletions
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14
hw/i386/pc.c
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@ -68,6 +68,7 @@
#include "qapi-visit.h"
#include "qom/cpu.h"
#include "hw/nmi.h"
#include "hw/i386/intel_iommu.h"
/* debug PC/ISA interrupts */
//#define DEBUG_IRQ
@ -1273,6 +1274,19 @@ void pc_machine_done(Notifier *notifier, void *data)
sizeof(pcms->boot_cpus_le));
}
}
if (pcms->apic_id_limit > 255) {
IntelIOMMUState *iommu = INTEL_IOMMU_DEVICE(x86_iommu_get_default());
if (!iommu || !iommu->x86_iommu.intr_supported ||
iommu->intr_eim != ON_OFF_AUTO_ON) {
error_report("current -smp configuration requires "
"Extended Interrupt Mode enabled. "
"You can add an IOMMU using: "
"-device intel-iommu,intremap=on,eim=on");
exit(EXIT_FAILURE);
}
}
}
void pc_guest_info_init(PCMachineState *pcms)